Remember these? I don't.

Give us your height, location, intended use of the bike and budget. We'll ignore you.

resources?
LBS, chainreactioncycles, wiggle, bikesdirect, bikeexchange, gumtree, craigslist, Diamondback and Raleigh corporate discount portals

>plagiarized from archive
If you look at a used bike, check the blades of the fork aren't bent back from the line of the head tube (crash), the frame for hairline cracks, the bearings all spin smoothly with no play, the wheels are straight and have evenly tensioned spokes, the cog teeth aren't badly worn (compare to each other and look for shark toothing), the cables aren't cracked, it brakes and shifts well and check the derailer cage doesn't move much when you wiggle it. Moderate surface rust is ok.
Most things aside from frame damage are just haggling points.
Take cash with you and haggle in person to get the best price.